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INT 1Ah,  09h (9)        Read Clock Alarm Time and Status         Convertible

    Reads the alarm time and status from the real-time clock.

       On entry:      AH         09h

       Returns:       CF         Set if clock operating; else cleared
                      CH         Hours (BCD)
                      CL         Minutes (BCD)
                      DH         Seconds (BCD)
                      DL         Alarm Status
                                    00h - Alarm not enabled
                                    01h - Alarm enabled but will not power-on
                                          system
                                    02h - Alarm enabled and will power-on
                                          system

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       Notes:         Note that all dates are in Binary Coded Decimal
                      (BCD). For example, June 1, 1985 will be set as CX =
                      1985; DX = 0601.

                      The real-time clock is the clock that runs even when
                      the computer is turned off. A CMOS battery is used
                      so that, even while the computer is off, the date,
                      time, and alarm time are maintained.

                      This service is available only for the PC
                      Convertible. ATs and XT-286s will set the Carry
                      Flag, thus reporting an error state. Previous
                      machines will report unpredictable results
                      (including the state of the Carry Flag).